Ex 12-6: agricultural land subjected to heavy rainfall of 10 days duration which caused groundwater recharge of 3mm/day. This water was drained by perforated pipes 20cm diameter laid at 2m depth below soil surface. If the depth of impervious layer 8m .find the spacing of drains to maintain the permissible groundwater table 1.5 m below soil surface. The hydraulic conductivity 0.5 m/day. Use any available equations (Hooghoudt , Kirkham and Dagan)

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Principles of Seepage

In hydrology, when water flows down in a pore or crack of unsaturated soil due to gravity, the deep layer of soil is called seepage. It is the slow movement of water in the soil layer. Seepage is mainly found near hydraulic structures and is responsible for the stability of earthen-type hydraulic structures.